Select two contrasting colors (contrasting colors are on opposite sides of the color wheel) as the basis for your color scheme to instantly brighten up the space (see Color Wheel).
Instead of painting the built-in shelving in a solid tone, add a touch of whimsy by alternating shelving colors from one hue to the next.
Benches and window seats can also be painted in a variety of colors.
Paint a "faux" rug to breathe life into a deteriorating or dark wooden floor, or paint the floor in its entirety.